Synthesis and Characterization of Carboxymethylated Cornstarch

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dc.contributor University of Helsinki, Polymers en
dc.contributor University of Helsinki, Department of Chemistry en Nurakhmetova, Zh. A. Kurbashev, E. P. Selenova, B. S. Borke, Tina Aseyev, Vladimir Kudaibergenov, Sarkyt 2019-06-17T12:20:01Z 2019-06-17T12:20:01Z 2019
dc.identifier.citation Nurakhmetova , Z A , Kurbashev , E P , Selenova , B S , Borke , T , Aseyev , V & Kudaibergenov , S 2019 , ' Synthesis and Characterization of Carboxymethylated Cornstarch ' , Izvestiâ Nacionalʹnoj akademii nauk Respubliki Kazahstan. Seriâ himii i tehnologii , vol. 1 , no. 1 , pp. 6-15 . en
dc.identifier.issn 2224-5286
dc.identifier.other PURE: 123182364
dc.identifier.other PURE UUID: e7cb4a7b-6ffc-41a8-a376-18a8fbea0883
dc.identifier.other ORCID: /0000-0002-3739-8089/work/58731731
dc.identifier.other ORCID: /0000-0001-8382-5195/work/58740453
dc.identifier.other WOS: 000458979900001
dc.description.abstract The aim of this study is preparation and characterization of carboxymethylated cornstarch (CMCS) for potential application as water based drilling fluids. The cornstarch was modified by sodium monochloroacetate. The structure of cornstarch and CMCS was established by H-1 NMR and FTIR spectroscopy. The degree of carboxymethylation of cornstarch determined by H-1 NMR spectroscopy was equal to 80%. The viscosity-average molecular weights (M-eta) of pristine cornstarch and CMCS calculated from Mark-Kuhn-Houwink equation [eta]=K-eta.M-a are equal to 2.15.10 (3) g.mol(-1) and 2.75.10(5 )g.mol(-1) respectively. The temperature dependent viscosity of CMCS was measured in water by Ubbelohde viscometer, while the rheological properties of CMCS in dependence of polymer concentration and ionic strength of the solution were evaluated by rheoviscometer. The thermal characteristics of samples were determined by differential scanning calorimeter (DSC) and thermogravimetric (TGA) and differential thermal analyzer (DTA). The morphological properties of cornstarch and CMCS were studied by scanning electron microscopy (SEM). The structural-mechanical, filtration and filter cake forming properties of drilling fluids and fluid loss indicators of CMCS were found. en
dc.format.extent 10
dc.language.iso eng
dc.relation.ispartof Izvestiâ Nacionalʹnoj akademii nauk Respubliki Kazahstan. Seriâ himii i tehnologii
dc.rights en
dc.subject 116 Chemical sciences en
dc.subject cornstarch en
dc.subject viscosity and rheology en
dc.subject carboxymethylated cornstarch en
dc.subject drilling fluids en
dc.title Synthesis and Characterization of Carboxymethylated Cornstarch en
dc.type Article
dc.description.version Peer reviewed
dc.type.uri info:eu-repo/semantics/other
dc.type.uri info:eu-repo/semantics/publishedVersion

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